61802237947 has 2 divisors, whose sum is σ = 61802237948. Its totient is φ = 61802237946.

The previous prime is 61802237923. The next prime is 61802237953. The reversal of 61802237947 is 74973220816.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61802237947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61802237947.

It is not a weakly prime, because it can be changed into another prime (61802237957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30901118973 + 30901118974.

It is an arithmetic number, because the mean of its divisors is an integer number (30901118974).

Almost surely, 2^61802237947 is an apocalyptic number.

61802237947 is a deficient number, since it is larger than the sum of its proper divisors (1).

61802237947 is an equidigital number, since it uses as much as digits as its factorization.

61802237947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 61802237947 in words is "sixty-one billion, eight hundred two million, two hundred thirty-seven thousand, nine hundred forty-seven".